Micah Kornfield created ARROW-8600:
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             Summary: [C++]Expose API for  pushing down rep/def level 
comparison down to decoder
                 Key: ARROW-8600
                 URL: https://issues.apache.org/jira/browse/ARROW-8600
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Micah Kornfield


[https://github.com/apache/arrow/pull/6985] shows the benefit of using SIMD for 
level to bitmap conversion.  We can do even better by exploiting RLE runs when 
doing comparisons.  Exposing an appropriate API and using that would likely 
improve real world use-cases even further.



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